Home>ASTM Standards>ASTM B399-04(R2021) pdf free download

ASTM B399-04(R2021) pdf free download

ASTM B399-04(R2021) pdf free download.Standard Specification for Concentric-Lay-Stranded Aluminum-Alloy 6201-T81 Conductors
1. Scope
1.1 This specification covers concentric-lay-stranded conductors, made from round aluminum-alloy 6201-T81 (hard: solution heat-treated, cold worked, and then artificially aged) wires, for use for electrical purposes. These conductors shall be constructed with a central core surrounded by one or more layers of helically laid wires (Explanatory Notes 1 and 2). N OTE 1—The aluminum alloy and temper designations conform to ANSI H35.1/H35.1[M]. Aluminum-alloy 6201 corresponds to Unified Numbering System alloy A96201 in accordance with Practice E527. 1.2 The values stated in inch-pound units or SI units are to be regarded separately as standard. The values in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. 1.2.1 For density, resistivity and temperature, the values stated in SI units are to be regarded as standard. 1.3 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
6. Joints
6.1 In conductors composed of seven wires, only cold- pressure joints or electric-butt, cold-upset joints are permitted in the six outer finished wires; no joints are permitted in the center wire. In other conductors, cold-pressure welds, electric- butt, cold-upset welds, or electric-butt welds may be made in the finished wires composing conductors, but such joints shall be not closer than prescribed in Table 4. Following welding, electric-butt welds shall be annealed for a distance of at least 6 in. [150 mm] on each side of the weld.
7. Lay
7.1 For Class AA conductors, the preferred lay of a layer of wires is 13.5 times the outside diameter of that layer, but the lay shall be not less than 10 nor more than 16 times this diameter. 7.2 For Class A conductors, the lay of a layer of wires shall be not less than 8 nor more than 16 times the outside diameter of that layer, except that for conductors composed of 37 wires or more, this requirement shall apply only to the two outer layers. The lay of the layers other than the two outer layers shall be at the option of the manufacturer, unless otherwise agreed upon.
8. Construction
8.1 The cross-sectional areas and the numbers and diam- eters of wires in the concentric-lay-stranded conductors shall conform to the requirements prescribed in Table 1, Table 2, or Table 3 as applicable (Explanatory Notes 2 and 6). 8.2 Where compressed stranding is required in order that the conductor may be properly insulated, one or more layers ofany stranded conductor consisting of 7 wires or more may be slightly compressed, thereby reducing the outside diameter of the conductor by not more than 3 %, provided that the area of cross section after compressing is in accordance with Section 12. N OTE 2—The user’s attention is called to the claim that certain compressed strand constructions may be subject to patent rights, for example: Patents 3,383,704 and 3,444,684.
9. Rated Strength of Conductor
9.1 The rated strength of a conductor shall be taken as that percentage, indicated in Table 5 of the sum of the strengths of the 6201 wires, calculated on the basis of the nominal wire diameter and the specified minimum average tensile strength given in Specification B398/B398M. 9.2 Tests for determining the breaking strength of a conduc- tor are not required by this specification but may be made if agreed upon between the manufacturer and the purchaser at the time of placing an order. When tested, the breaking strength of a conductor shall be not less than the rated strength if failure occurs in the free length at least 1 in. [25 mm] beyond the end of either gripping device, or shall be not less than 95 % of the rated strength if failure occurs inside, or within 1 in. [25 mm] of the end of, either gripping device (Explanatory Note 3). 9.3 Rated strength and breaking strength values shall be rounded to three significant figures, in the final value only, in accordance with the rounding method in Practice E29.

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